Nickel-modified molecular sieve SCR catalyst and preparation method thereof
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A technology of SCR catalyst and molecular sieve, which is applied in the field of catalyst preparation to achieve good adsorption performance, no biological toxicity, and easy reduction
Inactive Publication Date: 2016-05-04
LIUZHOU HAIDA NEW MATERIAL TECH
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[0004] A nickel-modified molecular sieve SCR catalyst and preparation method provided by the present invention solve the problem of SCR catalyzing NO at low temperature. x Revert to N 2 In the range of 240℃~470℃, NO x Conversion rate can be maintained at 98% or above
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Embodiment 1
[0020] This nickel-modified molecular sieve SCR catalyst uses ZSM-5 zeolite molecular sieve as a carrier, and also contains nickel element accounting for 1% of the ZSM-5 zeolite molecular sieve mass fraction, and the copper element is mainly distributed in the form of Ni2+ in ZSM-5 surface and shallow pores.
[0021] The preparation method is as follows:
[0022] A. Immerse a nickel nitrate solution with a nickel nitrate quality of 3 grams in 100 grams of ZSM-5, and stir at 75°C for 24 hours;
[0023] B. Then dry at about 120°C for 3.5 hours;
[0024] C. Calcining the obtained step B at a high temperature at about 550° C. for 3.5 hours;
[0025] D. Naturally cool the obtained product in step C to 15°C to 25°C.
[0026] The prepared catalyst is crushed to 20-40 mesh and used in SCR to catalyze the reduction of NOx to N2. At 260°C, the conversion rate of NOx reaches 88%; at 470°C, the conversion rate of NOx reaches over 95%. In addition, the conversion rate of NOx at 220°C i...
Embodiment 2
[0028] This nickel-modified molecular sieve SCR catalyst uses ZSM-5 zeolite molecular sieve as a carrier, and also contains nickel element accounting for 15% of the ZSM-5 zeolite molecular sieve mass fraction, and the copper element is mainly distributed in the form of Ni2+ in ZSM-5. surface and shallow pores.
[0029] The preparation method is as follows:
[0030] A, the nickel nitrate quality is 46.5 grams of nickel nitrate solution impregnated in 100 grams of ZSM-5, stirred at 75 ℃ for 24 hours;
[0031] B. Then dry at about 120°C for 3.5 hours;
[0032] C. Calcining the obtained step B at a high temperature at about 550° C. for 3.5 hours;
[0033] D. Naturally cool the obtained product in step C to 15°C to 25°C.
[0034] The prepared catalyst is crushed to 20-40 mesh and used for SCR to catalyze the reduction of NOx to N2, and the conversion rate of NOx reaches 98% at 240°C-400°C.
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Abstract
The invention discloses a nickel-modified molecular sieve SCR catalyst and a preparation method thereof, and relates to the technical field of catalyst preparation. The molecular sieve SCR catalyst comprises a ZSM-5 zeolite molecular sieve and a nickel element. The preparation method comprises the following steps: first, dipping nickel nitrate solution in the ZSM-5, and stirring for 24 hours at 75 to 85 DEG C; then, drying for 3.5 to 4.5 hours at 115 to 125 DEG C; next, roasting for 3.5 to 4.5 hours at the high temperature of 540 to 560 DEG C; finally, naturally cooling to room temperature to obtain the molecular sieve SCR catalyst. According to the nickel-modified molecular sieve SCR catalyst and the preparation method thereof, the problem of reducing NOx to N2 with catalysis in a low-temperature environment is solved; the conversion rate of the NOx reaches 98 percent or above; the reaction speed is faster than that at a high temperature; the catalyst is safe and has no biotoxicity.
Description
technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a nickel-modified molecular sieve SCR catalyst applied to the SCR denitrification technology and a preparation method thereof. Background technique [0002] Selective catalytic reduction technology (selective catalytic reduction, SCR) is currently the most promising application of nitrogen oxides (NO x ) out of stock technology. This SCR technology refers to the selective removal of NO by adding a reducing agent or reducing substances in the exhaust gas under the action of a catalyst. x Revert to N 2 , while avoiding the non-selective oxidation reaction of the reducing agent. The specific process is NH 3 (reducing agent) under the action of a certain temperature and a catalyst, the NO in the exhaust x Revert to N 2 . Therefore, the core of SCR technology is the catalyst. The currently used catalysts are generally based on TiO 2 as the carrier, with V 2 o 5...
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